Phone Comparison - Karbonn A21 vs Alcatel One Touch Star vs Karbonn A91

general General Info

Manufacturer Karbonn Alcatel Karbonn
Announced 2012 February 2013 January 2014
Status Available Available - March 2013 Available - January 2014
Colors Pearl White Black, White, Orange White, Black, Pink
Form Factor Candybar Candybar Candybar
Dimension - 117.9 x 60.8 x 9.7 mm
(4.64 x 2.39 x 0.38 in)
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Weight - 119.5 g (4.2.0.18 oz) -
2G Network GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 GSM 850 / 900 / 1800 / 1900 - 6010
GSM 850 / 900 / 1800 / 1900 - 6010D (SIM 1 & SIM 2)
GSM 900 / 1800 - SIM 1 & SIM 2
3G Network HSDPA 2100 HSDPA 900 / 2100 No
Messaging SMS, MMS, Push Mail, EMail, IM SMS, MMS, EMail, IM SMS, MMS, EMail, IM
Build Features - - Swipe Gesture

hardware Hardware and OS

OS Android OS, v4.0 (Ice Cream Sandwich) Android OS, v4.1 (Jelly Bean) Android OS, v4.2.2 (Jelly Bean)
Processor Dual-core 1.2 GHz Dual-core 1 GHz Dual-core 1.3 GHz, MTK 6572
GPU - - Mali-400MP
RAM 512 MB 512 MB 256 MB
Internal Memory 4 GB 4 GB (2.4 GB user available) 512 MB ROM
External Memory microSD, up to 32 GB microSD, up to 32 GB microSD, up to 32 GB

display Display

Type TFT capacitive touchscreen AMOLED capacitive touchscreen TFT Capacitive Touchscreen
Colors 256K colors 16M colors 16M colors
Size 4.5 inches 4.0 inches 4.0 inches
Resolution 480 x 800 pixels (207 ppi) 480 x 800 pixels (233 ppi) 480 x 800 pixels (233 ppi)
Screen-to-Body Ratio - 63.66% -
Multi-Touch yes yes yes

multimedia Multimedia

3.5mm Jack yes yes yes
Radio No - FM radio
Games Yes + Downloadable Yes + Downloadable Yes + Downloadable
Loud Speaker yes yes yes

camera Camera

Rear Camera 5 MP, 2592х1944 pixels 5 MP, 2592х1944 pixels 3.2 MP, 2048x1536 pixels
Flash LED flash LED flash No
Features Auto focus, Geo-tagging, Face Detection Auto focus, Geo-tagging Geo-tagging
Video Yes Yes Yes, 720p
Front Camera Yes, 1.3 MP [Similar] Yes, VGA [Similar] Yes, VGA [Similar]

connectivity Connectivity and Data Rate

GPRS Yes Yes Yes
Edge Yes Yes Yes
3G HSDPA, 7.2 Mbps HSDPA, HSUPA No
Bluetooth Yes, v2.1 with A2DP Yes, v4.0 with A2DP Yes, v2.0 A2DP, EDR
Wi-Fi Wi-Fi 802.11 b/g/n Wi-Fi 802.11 b/g/n, Wi-Fi hotspot Wi-Fi 802.11 b/g/n, Wi-Fi hotspot
USB Yes, microUSB v2.0 Yes, microUSB v2.0 Yes, microUSB v2.0
GPS Yes, with A-GPS support Yes No
Browser HTML HTML HTML

memory User Memory

Internal 4 GB, 512 MB RAM 4 GB (2.4 GB user available), 512 MB RAM 512 MB ROM, 256 MB RAM
Expandable Storage microSD, up to 32 GB microSD, up to 32 GB microSD, up to 32 GB

Apps Sensors

Fingerprint fingerprint not supported fingerprint not supported fingerprint not supported
Proximity Sensor proximity sensor present proximity sensor present proximity sensor present
Accelerometer Sensor accelerometer sensor present accelerometer sensor present accelerometer sensor present
NFC NFC not supported NFC not supported NFC not supported

battery Battery

Type Li-Ion Battery Li-Ion Battery Li-Ion Battery
Capacity 1800 mAh 1500 mAh 1500 mAh
Stand by Up to 200 h Up to 300 h (2G)
Up to 280 h (3G)
-
Talk Time Up to 5 h Up to 4 h 30 min (2G)
Up to 3 h 30 min (3G)
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